d. Press down on the center of the heat sink, and then press firmly on the
captive screws and tighten them, alternating between the screws in a
figure-8 pattern as illustrated on the heat sink label until they are
tightened. You can cause damage to the microprocessor if you tighten the
screws on one side first, rather than rotating. Rotate each screw one full
rotation at a time. Repeat this process until the screws are tightened.
10. Reinstall the microprocessor air baffle (see “Replacing the microprocessor air
baffle” on page 117).
Note: A microprocessor air baffle must be installed whenever the DIMM
connectors closest to the microprocessor (on the left and the right) are empty.
For example, when DIMM connectors 6 and 7 on the system board are empty,
a microprocessor air baffle must be installed on microprocessor 1. This is
applicable for all microprocessors.
11. Reinstall the DIMM air baffle (see “Replacing the DIMM air baffle” on page
116).
12. Reconnect any cables that you disconnected.
If you have other devices to install, do so now. Otherwise, go to “Completing the
installation” on page 116.
Thermal grease
The thermal grease must be replaced whenever the heat sink has been removed
from the top of the microprocessor and is going to be reused or when debris is
found in the grease. For information on the part number to order the thermal
grease, see “Replaceable server components” on page 195.
When you are installing the heat sink on the same microprocessor that it was
removed from, make sure that the following requirements are met:
v The thermal grease on the heat sink and microprocessor is not contaminated.
v Additional thermal grease is not added to the existing thermal grease on the
heat sink and microprocessor.
Note:
v Read the Safety information on page “Safety” on page vii.
94 System x3750 M4 Types 8722 and 8733: Installation and Service Guide
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